Share-Based Compensation - Option Activity under the Company's Stock Option Plans (Detail) - USD ($)	6 Months Ended		12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Number of Shares
Outstanding, beginning of period (in shares)	2,764
Exercised (in shares)	(2,764)	0
Outstanding, end of period (in shares)	0		2,764
Options exercisable end of period (in shares)	0
Weighted Average Exercise Price
Outstanding, beginning of period (in usd per share)	$ 6.94
Exercised (in usd per share)	6.94
Outstanding, end of period (in usd per share)	0		$ 6.94
Options exercisable at end of period (in usd per share)	$ 0
Weighted Average Remaining Contractual Term (in years)
Outstanding	0 years		1 year 25 days
Options exercisable	0 years
Aggregate Intrinsic Value
Outstanding	$ 0		$ 15,934
Options exercisable	$ 0